Question

End-diastolic volume (EDV) for each ventricle at the end of atrial systole is normally about:

a) 50 ml.
b) 70 ml.
c) 25 ml.
d) 120 ml.

Answer 1

The normal end-diastolic volume (EDV) for each ventricle at the end of atrial systole is approximately 120 mL, which represents the blood volume in the ventricles just before ventricular contraction.

Step-by-step explanation:

The question asks about the end-diastolic volume (EDV), which is the amount of blood in the ventricles at the end of atrial systole just prior to ventricular contraction. The EDV, also known as preload, is when the ventricles are filled to their capacity due to inflow during diastole. Atrial systole contributes additional blood, known as the 'atrial kick.'

At the end of atrial systole and just prior to ventricular contraction, a resting adult in a standing position normally has about 130 mL of blood in the ventricles. This volume represents the EDV or preload. Therefore, the correct answer to the student's question about the normal end-diastolic volume (EDV) for each ventricle at the end of atrial systole is approximately 120 mL as it closely approximates the range described.